postrm is in mgetty-fax 1.1.36-3.1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43  | #!/bin/sh -e
case "$1" in
    purge)
        # remove the configuration files in /etc/mgetty
        for file in faxheader faxrunq.config sendfax.config; do
	    if [ -f /etc/mgetty/$file ] ; then
	    	rm -f /etc/mgetty/$file
	    fi
	    if [ -f /etc/mgetty/$file.dpkg-old ] ; then
	    	rm -f /etc/mgetty/$file.dpkg-old
	    fi
	    if [ -f /etc/mgetty/$file.dpkg-new ] ; then
	    	rm -f /etc/mgetty/$file.dpkg-new
	    fi
	done
	rmdir /etc/mgetty || true;
	rm -f /var/spool/fax/outgoing/faxqueue_done
        rmdir /var/spool/fax/outgoing /var/spool/fax || true;
        rm -rf /var/lock/fax /var/run/mgetty-fax
	;;
    *)
	;;
esac
# Automatically added by dh_installdebconf/10.7.2ubuntu2
if [ "$1" = purge ] && [ -e /usr/share/debconf/confmodule ]; then
	. /usr/share/debconf/confmodule
	db_purge
fi
# End automatically added section
# Automatically added by dh_installinit/10.7.2ubuntu2
if [ "$1" = "purge" ] ; then
	update-rc.d mgetty-fax remove >/dev/null
fi
# In case this system is running systemd, we make systemd reload the unit files
# to pick up changes.
if [ -d /run/systemd/system ] ; then
	systemctl --system daemon-reload >/dev/null || true
fi
# End automatically added section
 |